Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  3f425ec9acc27b982f192ac24c8bea14f3c8f454

Set POST limit to 15mb

The default was 2mb, which is too small for large pages like Obama.

Change-Id: I6d2f1e25cc4d43f29bf0a14d8b4130be3b9ad6b2